Visible app stutter and dropped frames compromise mobile user experiences. This technical guide explains how to diagnose, profile, and fix performance jank in Flutter applications. Explore the crucial differences between UI and Raster thread bottlenecks, configure accurate target tracing via profile mode on real hardware, prune unnecessary widget rebuilds with DevTools. #Flutter #Dart #AppPerformance #MobileDevelopment #DevTools #SRE #AppJank #FinOps